A failure detection method for relays in inverters
A detection method and relay technology, applied in circuit breaker testing, instruments, measuring electricity and other directions, can solve the problems of false alarm relay abnormality, wrong wiring, etc., and achieve the effect of avoiding misjudgment
Active Publication Date: 2021-03-19
AISWEI NEW ENERGY TECHNOLOGY (YANGZHONG) CO LTD
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Problems solved by technology
For example, wrong wiring, while the relay is normal, it will also falsely report that the relay is abnormal
Or due to the abnormality of the control circuit and other components, but the relay is normal, it will falsely report that the relay is abnormal, etc.
Method used
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[0036] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art. It should be noted here that the descriptions of these embodiments are used to help understand the present invention, but are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not constitute a conflict with each other.
[0037] This embodiment provides a method for detecting failure of a relay in an inverter. The circuit diagram of the inverter is shown in figure 1 As shown, it includes an inverter module, an inductor, a control circuit (not shown in the figure) and multiple relays, and multiple relays are connected in series from the grid side or load side to the i...
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The invention discloses a failure detecting method for a relay in an inverter. The method comprises the steps that A one of the relays other than the Nth relay farthest from the grid side or the loadside is sequentially selected as a relay to be detected, so that relays located between the detected relay and the grid side or the load side are closed, and relays located between the detected relayand the inverter side are open; B whether the detected relay is failed is judged through the current detected by a current sampling unit on the side farther from the grid side or the load side when the detected relay is open or closed; C0 an inverter control circuit generates a detection voltage; C other relays are open, and whether the Nth relay is failed is judged through the current detected bya current sampling unit on the side closer to the grid side or the load side when the Nth relay is open or closed; and the steps A and B are carried out N-1 times. The method can avoid the situationof misjudgment and prevents detection blind spots.
Description
technical field [0001] The invention relates to the field of inverter detection, in particular to a failure detection method for a relay in an inverter. Background technique [0002] Due to safety requirements in conventional inverters, two or more relays need to be connected in series near the grid side or load side to achieve redundant protection, such as figure 1 shown. Before two or more relays are closed, it is first necessary to judge whether the functions of each relay are good so as to realize the action of closing and opening. After the relay function determines that the relay has no abnormal aging conditions, it can continue to connect to the grid or output power. [0003] For detecting whether the function of the relay is good or not, there are currently existing detection circuits, but there are detection blind spots or misjudgments. For example, wrong wiring, while the relay is normal, it will also falsely report that the relay is abnormal. Or due to the con...
Claims
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IPC IPC(8): G01R31/327
CPCG01R31/3278
Inventor 叶海军卢盈廖小俊
Owner AISWEI NEW ENERGY TECHNOLOGY (YANGZHONG) CO LTD